.GRO File Extension
File Type 1Graphic Object Bitmap
What is a GRO file?
Bitmap image format sometimes referred to as a GROB (GRaphic Object Bitmap); used by Hewlett-Packard scientific calculators, such as the HP-48 and HP-49; used for storing graphs, charts, and other graphics created on the calculator.
GRO files may be viewed on a computer using a supporting HP calculator emulator, such as Emu48.
File Type 2Allegro MIDI File
.GRO File Association 2
ASCII text file that defines audio in a MIDI representation; also contains "note tracks," which specify display data for the audio; can be imported (and subsequently converted to other audio formats) using Audacity'soption.